# std::shared_lock<Mutex>::unlock

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< cpp‎ | thread‎ | shared lock

void unlock(); |  | (since C++14)

Unlocks the associated mutex from shared mode. Effectively calls mutex()->unlock_shared().

std::system_error is thrown if there is no associated mutex or if the mutex is not locked.

### Parameters

(none)

### Return value

(none)

### Exceptions

- Any exceptions thrown by mutex()->unlock_shared().

- If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted.

### Example

| This section is incomplete Reason: no example

### See also

lock | locks the associated mutex (public member function)
release | disassociates the mutex without unlocking (public member function)

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